a really good price is 200-250 per window installed. Remember, the odds are you will not own this house for more than 10 years...new windows will certainly be better than whatever you have. Personally, I would not spend to buy all the bells and whistles. Construction is pretty similar in all of them. A company that backs their warranty is nice...the reality is, you likely won't have much trouble regardless of what you buy. Salespeople will tell you what you want to hear to make you feel good about your purchase.